Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 91: [MA] Poster II
O 91.59: Poster
Freitag, 30. März 2012, 11:00–14:00, Poster A
Experimental determination of the spin mixing conductance in YIG/Pt bilayers — •Philipp Ross1, Johannes Lotze1, Franz D. Czeschka1, Matthias W. Althammer1, Mathias Weiler1, Thomas Brenninger1, Rudolf Gross1,2, and Sebastian T. B. Goennenwein1 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — 2Physik-Department, Technische Universität München, Garching, Germany
A spin current is a directed flow of angular momentum. Since spin currents are independent of charge motion, they can also propagate in electrical insulators. One elegant way to generate a spin current is the process of spin pumping: the magnetization of a ferromagnet is driven into resonant precession, and relaxes by emitting a spin current into an adjacent normal metal. The efficiency of the spin pumping process is dependent on the spin-mixing conductance which is in the order of 1 × 1019 m−2 in a variety of conducting ferromagnets [1]. We have grown insulating yttrium iron garnet (YIG) thin films on gadolinium gallium garnet substrates by pulsed laser deposition, and covered them in situ with a Pt layer. On these samples, we simulaneously recorded ferromagnetic resonance and the DC voltage generated by the inverse spin Hall effect, at different fixed temperatures between room temperature and 3 K. We find the spin-mixing conductance to be in the range from 1.2 × 1018 m−2 to 8 × 1019 m−2, which is consistent with values measured on conductive ferromagnet/Pt interfaces. Financial support by DFG SPP 1538 is gratefully acknowledged.
[1] F. D. Czeschka et al., Phys. Rev. Lett. 107, 046601 (2011)